$-6+30x+75$
$36x^212x+1$
$-\left\{+\left\{+6+\left[-\left(5+2\right)-\left(4-16\right)\right]-13\right\}\right\}$
$x-[3a+2\left(-x+2\right)]$
$\frac{2}{x\sqrt{x}}$
$foci\:x^2=-16y$
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